Reduced-noise relay

Details Reduced-noise relay Reduced-noise relay

1999-03-25

2001-05-22

Gandhi, Jayprakash N. (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S816000, C439S271000, C181S198000, C181S202000

Reexamination Certificate

active

06236575

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention is directed to a reduced-noise relay, comprising
an inside housing from which inside terminals emerge through an inside terminal side,
an outside housing from which outside terminals emerge through an outside terminal side opposite the inside terminal side, and
flexible connecting conductors that extend between the respective sidewalls of the inside housing and of the outside housing and connect the inside terminals to respectively corresponding outside terminals.
It has already been variously proposed for damping the switching noises of a relay to introduce a relay encapsulated in an inside housing into an additional outside housing and to connect the electrical terminals between the inside housing and the outside housing via more or less flexible lines. Such embodiments are disclosed, for example, by JP-03-127 424 A. However, there is the problem that the noise transmission from the inside housing to the outside housing can only be inadequately prevented. When the flexible connecting conductors are implemented as comparatively stable sheet metal bands, they can in fact retain the inside housing spaced from the outside housing on all sides; however, they themselves transmit a relatively high proportion of the noise. When, however, these connecting conductors are manufactured of very soft material, then the connecting conductors cannot hold the inside housing at a stable distance from the outside housing. There is therefore the risk that the inside housing, for example following external blows, will lie against the outside housing at at least one side and transmit the switching noise directly onto the outside housing.
SUMMARY OF THE INVENTION
An object of the present invention is to improve a relay having a double-walled housing structure conforming to the type initially cited such that the noise transmission toward the outside is reduced further and that this noise reduction is also reliably retained.
This object is achieved in that an intermediate cap of elastic plastic is plugged over the inside housing and the connecting conductors, the intermediate cap, together with the connecting conductors, separating the inside housing from the outside housing on all sides.
Given the design of the invention, damping material in the form of an intermediate cap is arranged in the interspace between the inside housing and the outside housing, so that the inside housing cannot come into contact with the outside housing at any side. The connecting conductors, which are preferably designed as stranded conductors, can thereby be so soft that they likewise transmit no oscillations. The intermediate cap itself is preferably composed of elastomer. The end sections of the connecting conductors are preferably held by lead-throughs of a damping frame in the region of the open side of the intermediate cap. A damping plate, which is likewise composed of elastomer or a similar substance, can preferably additionally secure the distance between the inside housing and the outside housing in the space between the ends of the connecting conductors or the outside terminals.
The outside housing is preferably composed of an outside cap and of a base. The base can thereby comprise its own outside terminals, for example in the form of flat plugs, that are anchored in the material of the base by embedding or plugging. At the inside of the base, these outside terminals are then connected to the ends of the connecting conductors, which can occur with standard connection techniques, preferably by welding.


REFERENCES:
patent: 4258821 (1981-03-01), Wendt et al.
patent: 5407330 (1995-04-01), Rimington et al.
patent: 5579211 (1996-11-01), Hendel
patent: 5596483 (1997-01-01), Wyler
patent: 6005768 (1999-12-01), Jo
patent: 3-12742 (1991-05-01), None

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